Click on Jensen, select multimedia, then select "older models" and half way down you will find the link to the manual.

It sounds like you may have a problem with the audio settings, or equally likely that the wiring was not completed when the unit was installed - did the headphones ever work? - if so - also suspect the wiring, probably where the cabling from the unit is connected to the car's system.

Hope this helps more :)Sorry was a bad link should be:
http://www.audiovox.com/
Click on Jensen, select multimedia, then select "older models" and half way down you will find the link to the manual.
It sounds like you may have a problem with the audio settings, or equally likely that the wiring was not completed when the unit was installed - did the headphones ever work? - if so - also suspect the wiring, probably where the cabling from the unit is connected to the car's system.
Hope this helps more :)

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my jensen vm9510 ts turns on and you can listen the radio dvd's cd's but the screen do not come out even if you reset it and press the open button, so you can't seen anything is already coded to play dvd's with out eh parking brake. If any one can help me please.

At audiovox.com has some upgrade files for the jensen vm9312 that is supposed to fix this problem. First you have to find the vm9312 and then click on software updates. Audiovox makes Jensen products i believe.